Time reversal symmetry breakdown in normal and superconducting states in frustrated three-band systems
2013 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 88, no 22, 220511- p.Article in journal (Refereed) Published
We discuss the phase diagram and phase transitions in U(1) x Z(2) three-band superconductors with broken time reversal symmetry. We find that beyond mean-field approximation and for sufficiently strong frustration of interband interactions there appears an unusual metallic state precursory to a superconducting phase transition. In that state, the system is not superconducting. Nonetheless, it features a spontaneously broken Z(2) time reversal symmetry. By contrast, for weak frustration of interband coupling the energy of a domain wall between different Z(2) states is low and thus fluctuations restore broken time reversal symmetry in the superconducting state at low temperatures.
Place, publisher, year, edition, pages
2013. Vol. 88, no 22, 220511- p.
IdentifiersURN: urn:nbn:se:kth:diva-144136DOI: 10.1103/PhysRevB.88.220511ISI: 000332162300003ScopusID: 2-s2.0-84892384952OAI: oai:DiVA.org:kth-144136DiVA: diva2:712089
FunderKnut and Alice Wallenberg FoundationSwedish Research Council
QC 201404142014-04-142014-04-102014-04-14Bibliographically approved